For each term combination found, we'll tell you its position range.
On paid accounts, you'll see top10, top20 ... up to top 100, which means it's in the range of 10 prior to what's listed.
For example, top 30: This means it's within the 21-30 positions.
On free accounts you'll always see top100, which says the term position is somewhere in the top 100 results.
Note the "Last Update" column on the right, which states when was it last updated (when was it in the listed position).